The photographs that you see here were taken on a tour of the Bridgeport, CT Columbia Records factory in 1946. They provide a fascinating look at how music was reproduced in those days. The records we see being made, inspected, and shipped in these images are 10 inch discs that would have been played at a speed of 78 RPM. Today collectors refer to them by their speed - "78s" - but back then they were simply called records.